Summoned to Mildgard, Iruma Takumi's dream of a quiet life is shattered by his powerful alchemy skill!.

Hotaru Hinase, a first-year high school student, witnesses Saki Hananoi breaking up with his girlfriend. Hotaru finally agrees to date him after he always helps her, even though she doesn't really understand love and romance.

Two children who got swapped at birth grow up to become engaged to each other. It's an arrangement neither of them like, at first.